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The amount of nitrogen in an organic substance can be determined by an analytical method, called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammoinia. The ammoinia, which is a weak base, can be neutralized with hydrochloric acid , as described by the equation
NH3 (aq) + HCl (aq) ---> NH4Cl (aq)
If 80.0 mL of 0.150 M HCl (aq) is needed to neutralize all the NH3(g) from a 2.25G sample of organic material.
Calculate the mass percentage of nitrogen in the sample.
At a certain temperature and pressure 4.2 L of N2 reacts with 6.3 L of O2. If all the N2 and O2 are consumed, what volume of N2O3, at the same temperature and pressure, will be produced?
A tank containing carbon dioxide at 400K and 50 bar is vented until the temperature in the tank falls to 300K. Assuming there is no heat transfer between the gas and the tank
It takes 55.0 J to raise the temperature of an 11.7 g piece of unknown metal from 13.0 C to 25.0C. What is the specific heat for the metal?
A 25.0 mL sample of river water was titrated with 0.0010 M Na2Cr2O7 and required 8.3 mL to reach the end-point. What is the chemical oxygen demand, in milligrams of O2 per liter, of the sample?
The volume of a sample of ideal gas at 25 degrees celius is 372 mL. what will be the volume of the gas if it is heated at constant pressure to 50 degrees celius? what will the volume fo the gas be if it is cooled to -272 degrees celius.
How many moles of MgCl2 are present in 50.0 mL of 0.800 M MgCl2 solution?
what happens if cellulose is reacted with maleic anhydride C4H2O3? Again, how is the cellulose molecule/structure altered and what are the reaction by-products?
A pressure of 0.600 atm of nitrosyl chloride is sealed in a flask and allowed to reach equilibrium. If 27.0% of the NOCl decomposes, what is the equilibrium constant for the reaction?
determine the empirical formula of a substance (Vanillin) that contains 63.15% carbon, 5.30% Hydrogen, and 31.55% oxygen.
Calculate the approximate SO 2 mass emission in lb/day.
Calculate the wavelength, in naniometers, of the spectral line produced when an electron in a hydrogen atom undergoes
calculate the change in entropy when 25KJ of energy is transferred reversibly and isothermally as heat to a large block of iron at (a) 0C and (b) 100c.
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